Glass composition, glass composition for chemcial strengthening, strengthened glass article, and cover glass for display

Active Publication Date: 2016-07-28
NIPPON SHEET GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a glass material with low T4 values that can be produced using the float process. Using this glass material results in strengthened glass articles with a deep compressive stress layer and a high surface compressive stress.

Problems solved by technology

In this case, however, the value of the produced surface compressive stress or the depth of the formed compressive stress layer may be insufficient; for example, the value of the surface compressive stress may be less than 600 MPa or the stress layer depth may be less than 20 μm (see Comparative Example 5 of Patent Literature 1).

Method used

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Examples

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examples

[0097]Hereinafter, the present invention will be described in more detail by way of examples and comparative examples. The present invention is not limited to the examples given below.

[0098](Preparation of Glass Composition)

[0099]Silica, alumina, sodium carbonate, potassium carbonate, basic magnesium carbonate, and calcium carbonate, which are common raw materials of glass, were used to prepare glass formulations (batches) having the glass compositions shown in Tables 1 to 5. In some examples, sodium sulfate was used instead of sodium carbonate. Each of the prepared batches was put into a platinum crucible and heated in an electric furnace at 1550° C. for 4 hours to give molten glass. Next, the molten glass was poured and cooled on an iron plate to give a glass plate. Next, the glass plate was placed in the electric furnace and held at 600° C. for 2 hours, after which the furnace was powered off to slowly cool the glass plate to room temperature. In this manner, glass samples were o...

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Abstract

A glass composition of the present invention includes, in mol %, 66 to 72% SiO2, 1 to 4% Al2O3, 8 to 15% MgO, 1 to 8% CaO, 12 to 16% Na2O, and 0 to 1% K2O. A total content of MgO and CaO is in a range of 12 to 17%, and a molar ratio of CaO to the total content of MgO and CaO is in a range of 0.1 to 0.4. The glass composition of the present invention is suitable for production by the float process, and is suitable for chemical strengthening.

Description

TECHNICAL FIELD 54[0001]The present invention relates to a glass composition suitable for chemical strengthening, more specifically to a glass composition having properties suitable for production by the float process and for use in a cover glass of a display. The present invention also relates to a glass composition for chemical strengthening, a strengthened glass article formed by chemically strengthening the glass composition, and a cover glass for a display in which the strengthened glass article is used.BACKGROUND ART[0002]In recent years, there have been widespread electronic devices equipped with liquid crystal displays, organic EL displays or the like, and electronic devices equipped with touch panel displays. Glass materials have high surface hardness, and therefore are widely used as materials of cover glasses of the displays of these electronic devices. Such cover glasses are generally subjected to strengthening treatment because glass is a typical brittle material and be...

Claims

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Application Information

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IPC IPC(8): C03C3/087
CPCC03C3/087C03C21/002
Inventor SENSHU, YUTAKAKURACHI, JUNJI
Owner NIPPON SHEET GLASS CO LTD
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